megalomaniac /ˌmɛgəloʊˈmeɪniˌæk/ noun plural megalomaniacs
plural megalomaniacs
Learner's definition of MEGALOMANIAC
[count]
: a person who believes that he or she has unlimited power or importance : a person who has megalomania夸大妄想症患者 — megalomaniacal
/ˌmɛgəloʊməˈnajəkəl/ adjective